ACR Electronics PLB-350B Product Support Manual page 16

Red LED with or without beep,
Less than 4 additional "beeps",
Red LED, strobe flash (PLB-350B
only)
4. Battery witness seal failure
If your beacon flashes an initial red LED at the beginning of the Self-
test, this indicates that your electronic witness has been broken and you
have used more than the allotted battery life for self-testing. While the
beacon will still operate normally in a distress situation, ACR strongly
recommends you have your battery replaced and the electronic witness
reset to ensure that you will have 24 hours of battery power.
5. GPS acquisition test
This test is NOT required as 100% of all GPS receivers that leave ACR
have been tested to ensure they perform correctly. However, if you would
like to ensure your GPS receiver is working, please follow these
instructions very closely.
CAUTION: The following test should not be performed more than
twelve times during the life of the battery pack. Once this GPS testing
feature reaches 12 times, the feature will be disabled by internal software
until the battery is replaced.
NOTE: The GPS receiver is located under the bottom front portion of the
case. It is imperative that the receiver is not obstructed during the GPS
acquisition test or activation to ensure that the GPS receiver is acquiring
your latitude (LAT) and longitude (LON) position. This test must be
performed outside with a clear view of the sky.
Press the GPS button for greater than 5 seconds. Observe the beacon for
the entire GPS test. A beep and green LED will indicate that the GPS has
been turned ON. The beacon will beep every 5 seconds and the GPS will
remain ON until LAT/LON coordinates have been obtained or until 2
minutes have elapsed. If good LAT/LON data has been obtained, a single
406 MHz test signal will be sent out with location data and the GPS will be
turned OFF and the green LED will light for at least 3 seconds along with a
long beep. This LAT/LON data is not saved for use. The green LED
indicates that the GPS is functioning properly and that the beacon is in a
location or environment where it can receive the necessary signals from
satellites. If the GPS does not acquire good LAT/LON data, the GPS will
turn OFF after 2 minutes, followed with a RED LED light up for 3 seconds
along with a long beep, and no 406 MHz signal will be sent out.
Y1-03-0241-2D
transmission life is left in the
batteries.
Failed Self-test: Return unit
to ACR for service. Less
than 24
transmission life is left in the
batteries.
hours of
15